The flames started inside a dressing room at the Steelyard Commons location around 10:40 a.m. Tuesday.
Gray said store employees put out the fire with dry chemical before the fire department arrived.
The store was evacuated as a precaution.
One person suffered a minor hand injury and another suffered minor smoke inhalation.
The first refused treatment, the second was treated at the scene.
The dry chemical caused about $5,000 in damage to clothing.
Walmart closed after the fire and as of 4 p.m. Thursday did not say when it would reopen.
The fire is under investigation.